Vacuum operated pump



March 3, 1953 H. w. osBURN VACUUM UPERATED PUMP 3 Sheets-Sheet l Filed Feb. 28. 1947 .U

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March 3, 1953 H. w. osBURN 2,630,102

VACUUM OPERATED PUMP Filed Feb. 28, 1947 Z Sheets-Sheet 2 IN VEN TOR. /waeo fosa/eff WMM March 3, 1953 H. w. osBURN 2,630,102

VACUUM OPERATED PUMP Filed Feb. 28. 1947 3 Sheets-Sheet 5 INVENToR. //ow/ze@ h/ 0550/60/ f l BY n Patented Mar. 3, 1,953

VACUUM `OPERATED PUMP Howard W. Osburn, Detroit, Mich., assigner, iliy mesne assignments, to Hadley Manufacturing Company,.l)efance, .0hio, fa corporationofhio Application February 28, 1947,1SerialiNo, 7131545 The present "invention pertains to 'a novel vacuum-operated pump designed particularly 'for use'in connection withmotor vehicles for inflating'the tires.

The need for a portable `tire 'inlating device haslongbeen recognized, and some devices of this general `character have been suggested. These devices, if motor driven, require belting or an equivalent driving `connection to the motors. Since `such a device is used only Vvin those vcases where access to a service station cannot readily be had, the user may have forgotten how to use the apparatus or how to connect it or may have misplaced a `part of the driving connection Ato the motor. Motor driven pumps lose much of their utility for such reasons.

The principal object of the Ainvention is to provide a motor operated pump but one that does not reduire a driving connection to the motor. In other words, the pump of this invention is driven by the reduced pressure in theintake line or manifold. The connection to the reduced pressure source, if not permanent, can readily be established when needed. For example, a simple tting for making the connection maybe pro- 'l vided.

Another object `of the invention is to `provide apump that is double acting and `which therefore furnishes a continuous ilow of compressed air. Another-*object is to provide `a device of thischa-racter-that has a common port for supplying atmospheric air to operate against reduced pressure andfor supplying the -air that is cornpressed.

`The `pump itself `is of the diaphragm 'type including opposed and alined cylinders at opposite sides l'of the diaphragm chamber. The chamber is divided vinto two compartments by means of a diaphragm which is secured to the piston rod. Each compartment is connected to atmosphere by a port, adjacent to which is Aa third port adapted for connection to the source `of reduced pressure. An oscillating valveiis adapted to connect the suctionport to either of the atmosphere ports while leaving the remaining atmosphere port uncovered. Thus, one side of the diaphragm is under reduced pressure and the other side under atmospheric pressure 'to move the piston in one direction or the Vother. The position of the valve with respect `to `the atmosphere ports is alternately shifted by Aa connection to the'piston rod.

A passage is `formed through `each 'piston -to transfer atmospheric `air to thepressure faceof the "piston, These passages are cont-rolled by 4-Claim's. (Cl. 121-164) check valves that open under atmospheric pressure 4and Vclose under compression at 'the pressure face `of the piston. The cylinders have outlets at the ends ladjacent `:to the pressurefaces `oi' the pistons, `to provide continuous iiow of compressed air vina common line connected to both outlets;

The `outlets are also check-valve controlled "to close oithe suction stroke of the 'pistons'.

The invention is fully disclosed by way utexample in the 'following description 'and in the accompanying drawings inwhich:

Figure 1 is an elevation of the device installed;

:Figure 2 is -a longitudinal section ofthe device;

Figure 3 is a section on the `line ,"3-13 `ofFig ure 2;

Figure liis a section on the *line ll-igof Figure2;

Figure 5'is van elevation on the line 5--5 of Figure 4, showing the parts broken away;

Figure 6 is a section on y'the `line Vli'-E of Figure 4';

Figure 'l' is -af-section on-'theline 1--1 of Figure 4;

Figure is a detail endelev'ation';

Figure l10 is asection on theline l 0-10 o'fFigure-8, and

ure 4.

' Referenceto these views `will now be made .by use lof like charaoterswhich areemployetoydesignate correspondingparts throughout.

'The body of thedevice comprises v'a pair of bell shaped sections I rand 2, each formed 'with a `11e-e duced cylinder 3, `4, as shown more .clearly iin Figure 2. `'The `members vI vand 2 are :clamped together at their -open ends `to form la chamber 5, and in this position 'the cylinders 3, '4 are in axial valinement. flexible diaphragm 6 is clamped between the sections l Vand 2, dividing the chamber', and also shown `in Figure2.

A piston rodcomprising two sections 1 and 8 is mounted 'in the cylinders 3, Vl! fand `is Pmadefin 'two parts for the purpose Aof binding a pair Iof clamp `plates 9 against opposite surfaces of 'the diaphragm 6. -The section 'l has a reduced `and threaded end 'l0 screwed into fa tapped hole `lil in fthe section 8, thereby clamping the plates between the meeting ends ofthe sections 1, 8. Each'end of the piston vrod i-sfc-rmed with ahead l2-s1idab1yeng-aging the inner Wall of the adjacent cylinder, -and 'next fto each head `|12 is ka adjacentcylinderwall.

On the section 2 is formed an enlargement I4 for the provision of several ports that will now be described. A transverse port I5 (transverse with .respect to the piston rod) is adapted to receive a metal nipple I6 (Figure 4) which in turn is joined by a tube I'I (Figure 1) to a suitable low pressure source such as the intake manifold I8 of the engine of a motor vehicle. A longitudinal port I9 is formed through the block I4 and is spaced from the port I5. Ports and 2I extend respectively from the ports I5, I9 through the top of the block I4 and are covered by a control plate or valve 22 pivotally mounted on a screw 23. The bottom surface of the valve 22 has a channel 24 adapted to connect the ports 20 and 2| as in Figure 5, or in another position to obstruct the port 20. Another slot25 in the member 22 receives a pin 23 mounted in the top of the block I4, whereby to determine the two positions of the plate 22. A finger piece 2l is used for movingthe plate.

Longitudinal ports 25 and 23 are formed from the outer face of the block I4 at opposite sides of the port I9, the port 25 being at a higher level than the port 28. The port 25 leads directly to the chamber 5 at the nearer side cf the diaphragm 5, as shown in Figure 11. The higher port 29 extends along the outside of the chamber 5 through a port 30 in the diaphragm 3 and through suitable channeling 3| in the section l to the opposite side of the diaphragm 5, as shown in Figure 10.

A reversing valve in the form of a plate 32 is mounted against the outer face of the block I4 on a pivot pin 33 Vthat is parallel to the piston rod. The inner face of the valve 32 is formed with a channel 34 adapted to connect the suction port I9 to either the port 2B or the port 29 while leaving the unconnected port exposed to atmosphere. In the position of the valve shown in Figure 8, the side of the diaphragm exposed 'to the port 28 is subject to sub-atmospheric pressure, while the opposite side of the diaphragm is eX- posed to atmospheric pressure through the ports 29 .and,3 at the channel 3L This condition is reversed when the valve 32 is shifted to connect the port 29. Mechanism is provided for oscillating the reversing valve 32 and thus reciprocating the piston rod 'I, 3 through the diaphragm 6. The piston rod is adapted to function as a double acting pump, as will be described hereinafter, and the mechanism for oscillating the valve 32 will now be described. Y

A rock shaft 35 (Figures 2 and 7) is rotatably mounted in the section 2 adj acentto the cylinder 4 and perpendicular to the axis of the cylinder. On the shaft 35 is secured a finger 35 extending into the chamber 5 where it joins the cylinder il. As the piston rod I, 3 is reciprocated, the finger 36 is struck on one side by a collar 3l near the center of the rod and cn the other side by a lug 0r abutment 33 atthe head l2 in the cylinder li,` thereby rocking the shaft 35. This motion of the shaft 35 is utilized to oscillate the reversing valve 32.A To the shaftV 35 is fastened a yoke 39 .externally of the section 2 and cylinder 4, as shown in Figure 2. A fork 43 is pivotally mounted at 4I Aon the section 2 and extends through the yoke 39 where it carries a lateral pin 42 extending between the ends of the yoke to be engaged alternately thereby in theY rocking movement of the yoke withvthe shaft35. The shaft 33 loosely carries an arm 43 from which a pin 44 extends vinto the fork 45. The valve 32 is also loose on the pin 33, and it is evident that the oscillation of the fork swings the arm 43. As the arm 43 reaches the ends of its stroke, its movement is delivered to the valve 32 by engagement with pins 45 mounted on the ends of the valve.

A compressed coil spring 45 is extended along the fork 45, from the pin 44 to another pin 4l on the fork at a point nearer the yoke 39. In either position of the valve 32, this spring is distended in an over-center position with respect to the shaft 33, so that the fork is thrown with a snap action as it passes the center of the shaft 33 in either direction, thereby shifting the valve 32 with a quick movement. The movement of the valve itself is arrested by stop pins 48 at opposite sides thereof on the block i4.

For the pumping action by the pistons on the ends of the piston rod. each end is formed with a chamber 53 and is ported at 5I from the chamber into the cylinder 3 or 4 at the inner side of the piston. A valve seat 52 is formed between each chamber 5I) and port 5I and is covered by a loose disk valve 53 having guiding lugs 54 engaging the wall of the chamber 5i). Into the outer end of the chamber is screwed a plug 55 having passages 55 therethrough and serving as a retainer for a coil spring 5l that holds the valve 53 seated.

The outer end of each cylinder 3, 4 is formed as a reduced nipple 58 that receives a pipe fitting 55. a line 50 and thence by a line or hose V6I to a vessel for receiving the compressed air, such as the inner tube of a tire; Each nipple 53 is formed with a valve seat 32 adapted to be closed by a ball valve 63 backed by a spring 54 seated in the adjacent tting 59 and closing the valve in the direction toward the adjacent end of the piston.

in the operation of the device, the low pressure in the line Il is alternately transferred from one side of the diaphragm 6 to the other by the means already described, while the remaining side of the diaphragm is exposed to atmospheric pres.. sure. The resulting oscillation of the diaphragm reciprocates the piston rod ll, 3. Atmospheric pressure in one side of the chamber 5 opens the valve 53 in the piston at the same side, and atmospheric air is communicated to the expandingl cylinder 3 or 4 between the piston and the ad- .jacent ball valve 53 which, however, remains seated at this time. As the direction of the piston rod is reversed by the means already described, the aforementioned valve 53 closes, and the air in he contracting cylinder is compressed and expelled through the now opened valve 63.. At the otherv end of the piston rod, where the cylinder is expanding, atmospheric air is drawn into the expanding cylinder in the manner al# ready described and is compressed and expelled on the next Vreversal of the piston rod. Thus,- the device functions as a double acting pump and furnishes a substantially constant stream of compressed fluid inthe hose 6I.

Y The pumping unit is relatively small and can. easily be mounted on the dashboard or another" p-art of a motor vehicle. The manner of connection to the manifold I8 is also relativelyl simple. The pumping unit may, if desired, be unmounted and held in the hand while in use. ln such case a convenient means of connection to the intake manifold is furnished. In either" case. the connection to the intake manifold as a source of motive power is considerably vsimpler than adapting the motor for thebelt or chain The two fittings are joined to each other by Y drive for a rotary pump. A cover 65 may enclose the valve 32 and its operating mechanism and would have an opening of sufcient size to supply atmospheric air at the required rate.

Although a specific embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention as indi.. cated by the appended claims.

What I claim is:

1. In a pump, in combination, a housing formed with two compartments, a reciprocable piston rod in said compartments, said housing being formed with a pair of ports for establishing communication between the compartments and the atmosphere, said housing having a third port adapted for connection to a reduced pressure source; a relatively movable valve mounted on said housing and arranged to selectively establish communication of the third port with either of the other ports while uncovering the remaining port to the atmosphere; a rock shaft journaled on the housing; a finger on the rock shaft disposed interiorly of the housing; means on the piston rod arranged for alternate engagement with the 1inger to oscillate the rock shaft at each reciproca tion of the piston rod; an arm pivotally mounted on the housing; a lever pivotally mounted on the housing for movement about a different axis; an operative connection between the lever and the rock shaft; a lost motion connection between the arm and the valve, and means including a snap action spring connected to said arm whereby movement of the rock shaft is transmitted by said lever and arm to said valve through the lost motion connection.

2. In a pump, in combination, a housing formed with two compartments, a reciprocable piston rod in said compartments, said housing being formed with a pair of ports for establishing communication between the compartments and the atmosphere, said housing having a third port adapted for connection to a reduced pressure source; a relatively movable valve mounted on said housing and arranged to selectively establish communication of the third port with either of the other ports While uncovering the remaining port to the atmosphere; a rock shaft journaled on the housing; a finger on the rock shaft disposed interiorly of the housing; means on the piston rod arranged for alternate engagement with the finger to oscillate the rock shaft at each reciprocation of the piston rod; an arm supported for pivotal movement about the pivotal axis of the valve and independently thereof; a lever pivotally mounted on the housing for movement about an axis spaced from the axis of said valve and arm; spaced abutments on said valve; arranged to be successively engaged by the arm to move the valve; an operative connection between said rock shaft and lever, and a spring connected to said arm and arranged to bias the arm to valve shifting position when said arm is moved by said lever at each reciprocation of the piston rod.

3. In a pump, a housing forming a chamber divided into two compartments, a piston rod in said compartments, said housing having a pair of ports connecting said compartments to atmosphere and a third port adapted for connection to a reduced pressure source, a valve plate pivotally mounted on said housing and having a channel formed therein adapted to connect said third port to either of the other ports while leaving the remaining port exposed to atmospheric pressure, a rock shaft journalled in said housing and extending from the exterior to the interior thereof, a finger of said shaft within said housing, means on said piston rod at opposite sides of said finger for engaging said nger in either direction of movement of said rod, an arm pivotally mounted on said housing co-axially with said valve for restricted movement independently thereof, stops on the ends of said valve and engageable by said arm to move the valve, and a fork having slidable connection with said arm and pivotally mounted onV said housing and adapted to be swung by movement of said rock shaft.

4. In a pump, a housing forming a chamber, divided into two compartments, a piston rod in said compartments, said housing having a pair of ports connecting said compartments to atmosphere and a third port adapted for connection to Va reduced pressure' source, a valve pivotally mounted on said housing and adapted to con nect said third port to either of the other ports While leaving the remaining port exposed to atmospheric pressure, a rock shaft journaled in said housing and extending from the exterior to the interior thereof, a finger of said shaft within said housing, means on said piston rod at opposite sides of said finger for engaging said finger in either direction of movement of said rod, an arm pivotally mounted on said housing co-axially with said valve for restricted movement independently of the valve, stops on the ends of said valve and successively engageable by said arm for moving the valve to alternate positions, a fork pivotally mounted on said housing on an axis displaced from the axis of movement of the valve and adapted to be swung by movement of said rock shaft, and a snap action spring connecting said fork to said arm and adapted to throw said arm as the spring crosses the common axis of said valve and arm to move the valve.

HOWARD W. OSBURN.

REFERENCES CITED The following references are of record. in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,663,666 Moskovitz et al. Mar. 27, 1928 1,694,279 Oishei Dec. 4, 1928 1,923,333 Soter Aug. 22, 1933 2,136,475 Stroup et al. Nov. 15, 1938 2,141,703 Bays Dec. 27, 1938 2,188,646 Bunch Jan. 30, 1940 2,209,090 Perotti et al. July 23, 1940 2,276,358 Vickers Mar. 17, 1942 2,450,564 Sacchini Oct. 5, 1948 

